"Today the ZFS on Linux project reached an important milestone with the official 0.6.1 release! Over two years of use by real users has convinced us ZoL is ready for wide scale deployment on everything from desktops to super computers."

I guess that would depend on who you speak to. Danese Cooper, who worked as an open source evangelist for Sun, has stated that many engineers did push for a GPL incompatible license.

Obviously there'd be other reasons behind such a decision (unlike you, I'm not claiming an either/or argument) and obviously those leading public talks would dismiss the whole "GPL incompatible" argument because it's simply bad PR. So you're clearly going to find plenty of sources that cite other reasons for how CDDL turned out the way it had. But those points aren't mutually exclusive from what I've been saying either; the idea of Sun's code being copied verbatim into Linux wasn't a favorable amongst Sun engineers. It really wasn't and thus many engineers did push for CDDL to be GPL incompatible.